What kind of creature is this worm or slug?

[Garyakala]

Can someone gives me an explanation of what kind of worm or slug is this? Thank you very much.

 

[ISpeakForTheSeas]

Can someone gives me an explanation of what kind of worm or slug is this? Thank you very much.

You may need a closer up pic/video to get a good ID, unfortunately.

 

[StatelineReefer]

Red planaria flatworm If you see one, it's too late.

 

[EeyoreIsMySpiritAnimal]

Red planaria flatworm If you see one, it's too late.

Too late for what??

 

[StatelineReefer]

Too late for what??

For simple removal, I had these in a tank, they grew to plague proportions. Six line will control them or keep them at bay, but a six line can only eat so many in a day, and they multiply fast

 

[Garyakala]

Thank you guys for the replies. Are Red planaria flatworms harmful or beneficial?

 

[StatelineReefer]

Thank you guys for the replies. Are Red planaria flatworms harmful or beneficial?

Jury is out on harmful, their main diet is diatoms and copepods, as well as othet microfauna. But they aren't beneficial in any way... I would call it Undesirable Neutral.

 

[vetteguy53081]

Red planaria one of the headache types and will feed on mucus, smother bases of coral and block the needed light for production of zooxanthellae which is their energy source.
Removal can be accomplished by siphoning them with a 3/8" tubing into a nylon stocking and discard
OR
Add a wrasse such as Yellow coris, 6 line, lunare or malanurus OR even a springieri damsel which will eat them

With the number you have, for the next 2 weeks you will have to look for eggs and scrape off as there is likely some and would be future acoels. Eggs are really tiny

 

[Garyakala]

Thanks for giving me advices of how to remove or control them